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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

41634 results found.

  1. GRB030329: RTT150 optical observation
  2. GRB030329: More AAVSO VR obs
  3. GRB030328: R upper limit after 6 hours by MASTER
  4. GRB 030329: BV photographic observations
  5. GRB 030329: SARA Optical Observations
  6. GRB 030329: SARA Optical Observations
  7. GRB 030329, BVRI photometry
  8. GRB030329: Optical observations
  9. SDSS 0.5m PT observations of GRB030329 (correction)
  10. SDSS 0.5m PT observations of GRB030329
  11. GRB 030329, Optical observations
  12. GRB030329, cessation of fading
  13. GRB030329: final R-band light curve by MASTER
  14. GRB030329 - more 15 GHz radio data
  15. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  16. GRB 030329: Sub-millimeter detection
  17. GRB 030329: SARA Optical Observations
  18. GRB 030329: SARA Optical Observations
  19. OT GRB light curves and SN predictions
  20. GRB030329, optical observation
  21. GRB030329, new UBVRcIc field photometry
  22. GRB030329: optical observations at Tokyo Tech
  23. GRB 030329: optical observations
  24. GRB030329: multiple re-brightening phases
  25. GRB 030329, BRI photometry
  26. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  27. GRB 030329 , SPM optical observations
  28. GRB030329: Optical observations at Teramo
  29. GRB 030329: Radio observations at GMRT
  30. GRB030329: more 15GHz observations
  31. Further AAVSO V,B,R observations of GRB030329
  32. GRB 030329: Additional Mt. Laguna Optical Observations
  33. GRB 030329: SARA Optical Observations
  34. GRB 030329: Observations with ANDICAM
  35. GRB030329: Optical observations
  36. GRB030329: further optical photometry and evidence for a light curve discontinuity
  37. GRB 030329: Correction to GCN 2056
  38. GRB 030329: fitting parameters and re-brightening
  39. GRB 030329: KAIT optical photometry
  40. GRB030329 Further RBO Optical Observations
  41. GRB 030329: SARA Optical Observations
  42. AAVSO V & R observations of GRB030329
  43. GRB 030329: optical observations
  44. GRB 030329: beginning of the new fading phase in optical band
  45. GRB 030329, optical spectroscopy
  46. GRB 030329: fading X-ray afterglow with RXTE
  47. GRB 030329: optical photometry
  48. GRB030329: Optical observations
  49. Photometry of GRB030329 - Constant OT Magnitude
  50. GRB 030329, R-band observations
  51. GRB 030329: further optical observations
  52. GRB030329 - OT brightens
  53. GRB 030329: OT observations at Kanazawa
  54. GRB030329 15 GHz radio observation
  55. GRB 030329 RBO V Optical Observations
  56. GRB 030329, optical photometry
  57. GRB030329: Near Infrared Observations
  58. GRB 030324: Optical and NIR Observations
  59. GRB 030328, optical photometry
  60. GRB030329: R band light curve by MASTER
  61. GRB030329 - Light curve flattening
  62. GRB 030329: SARA Optical Observations
  63. GRB 030324, optical search
  64. GRB030329 - near contemporaneous optical limits from CONCAM
  65. GRB030329: R and B observations
  66. GRB 030329, optical observations
  67. GRB030329: Optical observations
  68. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  69. GRB 030329: Light curve observed during the change of its slope.
  70. GRB030329, BVRcIc field photometry
  71. GRB030329, SPM optical observations
  72. GRB 030329: Optical Decay
  73. Redshift of GRB 030329
  74. GRB030329: ROTSE network observes steepening of decay curve
  75. GRB 030329, optical photometry
  76. GRB 030329: Optical decay and synthesis
  77. GRB030329 optical observations
  78. GRB030329: optical spectroscopy with the TNG
  79. GRB 030329: Radio Observations
  80. GRB 030329, optical spectroscopy
  81. GRB 030329: still bright
  82. GRB 030329: Optical pre-Imaging
  83. GRB 030329: visual observations
  84. GRB 030329: Upper limit from 5.6 hours before trigger
  85. GRB030328: R optical observation
  86. GRB030328: X-ray Afterglow Observed with Chandra
  87. GRB 030323: Gemini South VRI obsevations.
  88. GRB030329: Optical observations
  89. GRB 030329, R-band observations, supplement
  90. GRB030329 optical observations
  91. GRB030329:optical observations by MASTER
  92. GRB 030329: optical observations
  93. GRB 030329, R-band observations
  94. GRB 030329: OT B and R photometry, decline rate
  95. GRB030329: Upper limits from recent and historical observations.
  96. RXTE detection of GRB 030329 afterglow
  97. GRB 030329: Optical Afterglow Observations
  98. GRB 030329: precise position from Kyoto images
  99. GRB 030328 Optical Observations
  100. GRB030328: Decay index

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